Safety pad for stud driving tools



2 Sheets-Sheet l V. R. ERICKSON ETAL SAFETY PAD FOR STUD DRIVING TOOLS lll\\\\\\\\\\\\\\\\\\ l.. NN w s June 1,41954 Filed Dec. 2, 1949 June l, 1954 v. R. ERICKSON ErAL SAFETY PAD FOR STUD DRIvINGTooLs 2 Sheets-Sheet 2 Filed Dec. 2. 1949 INHIWHHH Q l ws L ,D M., .w 3. s. m w

Patented June 1954 SAFETY PAD FOR STUD DRIVING TOOLS Virginius R. Erickson and Benjamin B. Bullwinkle, Portland, Oreg., assignors to Powder Power Tool Corporation, Portland, Oreg., a corporation of Oregon Application December 2, 1949, Serial No. 130,818

5 Claims.

The present invention relates to tools for driving studs into walls, such as concrete, and into steel structure, by means of an explosive action and is concerned more particularly with a tool of the above character which is constructed for Safe operation particularly when used in corners or adjacent walls. The tool structure is such that two inoperable halves areprovided when the tool is broken in two for loading and in this condition of the parts the Firing pin mechanism of the tool is positively held against accidental loading or conditioning of this ring mechanism for a ring operation.

The invention is concerned more particularly with a provision of a deector pad construction carried for engagement with the surface into which the stud is to be installed, this pad being adjustable to allow the optimum positioning of the tool with respect to the surface so that it can be used up against walls and in corners while maintaining the safety feature of delector pad operatively engaged with the surface at the time of the iiring of the stud into the surface. The tool also provides a dust deiiecting structure at the barrel to prevent blowing of dust back into the mechanism. More particularly, the ring pin mechanism upon separation of the tool into two halves is positively locked against cooking of the firing pin spring and is automatically unlocked or unlatched when the halves are again assembled in position for firing.

The above and other objects of the invention are attained in the preferred embodiment described herein in connection with the accompanying drawings, in which:

Figures la and 1b are a composite longitudinal sectional view through the tool with the parts shown in their normal position prior to any operation of the tool.

Figure 2 is a sectiona1 view similar to Figure la showing the rear half or handle portion of the tool with the ring pin carrier locked against receding movement to cock the ring pin spring.

Figure 3 is a top plan view of the delector pad structure with certain portions broken away to illustrate details of construction.

Figure 4 is a fragmentary sectional View taken as indicated by the line 4--4 in Figure la.

- tober 28, 1949, for Stud Driving Tool, to which parts not specifically dis- IS of generally cylindrical shape and a breechy block or ring pin carrier I4 for a ring pin I6.

The breech block It. has a threaded connection at its forward end to a barrel I7 to hold therebetween a removable breech plug I8 disposed in a central enlarged bore of the barrel Il. A barrel l liner I9 is seated in the end of the enlarged bore Figure 5 is a view similar to Figure 1b illus- I trating the relative position of the parts at the time the barrel and the deilector pad are engaged with the surface into which a stud is to be installed.

In general, the tool is of the type disclosed and claimed in the (1o-pending application of Smith and Daugherty, Ser. No. 124,078, led Ocin the barrel for holding a iianged stud 2| to be driven from the barrel into a wall. A cartridge providing the explosive charge is shown at 22 in the breech plug. About the barrel I'I there is a barrel guide sleeve 23 between which and a snap ring 211 a barrel spring 26 is held.

A firing or deector pad structure 2'! is disposed about the muzzle of the barrel being carried by a sleeve 23 having a spring 29 associated therewith which seats at its other end against a shoulder of the barrel guide sleeve Z3. A shell or housing sleeve SI encloses the spring 29 and associated pai-ts and is connected to the housing Ii? as later described. A dust deector cup 32 of resilient material is carried by the barrel l'l at its outer end for receding movement into a central recess 33 of the deiiector pad structure 2'! as later described. V

Referring in detail to Figure 1a the housing i9, as previously explained, rotatably receives the grip I I which has mounted therein an end support plate 35 and a sleeve 36 which has a shoulder engaging the housing Iii and whose end in turn engages a shoulder on the housing IU. The grip II is maintained on the housing I0 by means of a set screw 3l carried by the cam cylinder I3 whose head is disposed within a suitable aperture in the sleeve 36 and passes through a circumferential slot 33 of (Figures la and 4) the housing Ill so that the grip II and the housing IB have limited rotative adjustment with -respect to each other. Within the recessed end of the housing IB, there is provided a guide plate 4i secured in place by a snap ring 42, the plate 'il receives the rear end of the firing pin I6 which has secured thereon a keeper ring 43. A firing pin spring 4d is interposed between the guide plate 4| and a snap ring d5. The forward end of the firing pin It is slidably mounted in a bored 3 passage of the breech block |4 and the ring pin is provided with an annular groove 41 to receive a trigger 48 which is engaged'with the groove under the influence of a suitable spring.

The ring pin carrier I4 (Figure la) is provided with a stud engaging in a milled groove 52 in the interior bore of the housing l0 and is provided at 53 with a threaded connection with the barrel |1, the screw 5| serving to prevent rotation of the firing pin carrier during engagement of the barrel with the carrier.

As previously explained the tool is placed in condition for firing by pressing the barrel against the surface against which the stud is to be fired so as to cause the ring pin carrier to recede until the upper end of the trigger 48 is received within a notch 54 in the control cam I3, at which time a roller 56 on the firing pin carrier becomes aligned with an enlarged portion at the rear of a control groove 51 in the control cam cylinder |3. This operation then permits relative turning of the grip and control cam I3 with respect to the body I0 and the firing pin carrier I4 to cause disengagement of the trigger 48 to release the ring pin for engagement with the cartridge. The above mechanism is of the general type disclosed in said application.

In order to prevent cocking of the ring pin and receding movement of the firing pin carrier when the two halves of the tool are separated, the ring pin carrier is provided with a locking opening or notch 6| for engagement by an ear 62 on a locking lever or a latch B3 pivoted at 64 in the body I0 and urged to latching engagement by a compression spring 66. The lever 63 is disposed within an opening in the housing I0 which has a cover plate 51. The lever 53 is normally held inactive as shown in Figure la by the edge of a retainer nut 68 which has threaded engagement with the shield 3| and abuts the end of the barrel guide sleeve 23. It will be seen in Figure la that the retainer nut 68 abuts one face of an internal anular rib 69 oi the housing |Il in the assembled condition of the parts. The other face of the rib 69 provides a stop for the ring pin carier IG in its forward position.

In order to prevent relative rotative movement of the sleeve 3 I, the barrel guide sleeve |1, and the barrel I1, the sleeve 3| (Figure la) has an aperture engaged by the head of a stud 1I carried by the barrel guide sleeve I1 also the barrel guide sleeve carries a second stud 1.2 engaging in a longitudinal groove 13 in the barrel to maintain the relative position of the parts during receding movement of the barrel in placing the tool in condition for firing. At the forward end of the housing or shield 3I (Figure 1b) there is provided a retainer collar 'It having a press-fit therein and engaged by the flanged end 11 of the deflector mounting sleeve 28 which is guided within the retainer collar or bearing member 16. The flange 11 preferably has a rounded contour engaging within the shield 3|.

.as previously explained the deflector pad is of special construction to enable easy adjustment of the tool for operation adjacent walls or in corners and for this purpose the deflector pad (Figures 1b and 3) is provided with an outer or main pad portion of generally rectangular contour comprising a metal plate SI having a rubber pad portion 82 secured thereto by a plurality of screws 83. Both the plate 8| and the pad 82 are provided with an eccentrically located aperture to receive a central pad portion B4 secured by three screws 85 to a mounting or swivel plate 86 of slightly greater diameter. The plate B6 is rotatably secured to the plate 8| by a pair of arcuate retainer and guide rings 81. The mounting plate 8B for the adjustable central portion of the delector pad is providedwith an ececntrically disposed mounting aperture B8 by means of which it is pressed on the end of its mounting sleeve 28. As shown in Figures 1b and 5 the central pad portion SLI- 86 is positioned with respect to the outer portion 8|-82 to place the aperture 88 of the center plate in a concentric position with respect to the outer plate 8| (shown also in phantom lines in Figure 3). In full lines in Figure 3, the plate 8B has ben rotated to place the opening 88 and correspondingly the barrel I1 in its outermost position with respect to the deflector pad structure so that the tool can be positioned closely adjacent a wall for firing.

As previously explained the central portion 84 of the pad structure is apertured or recessed at 33 to pass the barrel and to provide clearance for the cupelike dust deflector 32 of rubber-like material. The defiector collar or cup 32 (Figure 1b) is seated in an annular groove 89 adjacent the end of the barrel to place the lip of the dust deector cup closely adjacent the point of impact of a stud with the surface into which it is to be driven. The cup prevents dust having direct access to the sliding surfaces of the barrel and the deflector mounting sleeve 28.

The operation of the tool will be briefly reviewed. 'Ihe tool is loaded by separating the rear and front halves thereof. The rear half is shown in Figure 2, the latch 63 being in active position with respect to the firing pin carrier so that no accidental rearward movement of this carrier can take place while the tool is disassem bled or during subsequent reassembly of the two halves. In the forward part or front half of the tool, the stud 2| and the cartridge 22 are installed as shown in Figure la and the two halves of the tool are then reassembled and during this operation the leading edge of the retainer collar et will engage an inclined surface of the lever t3 immediately rearwardly of its pivot point 64 as shown in Figure la to move the lever to inactive position. As a result, the tool is loaded and ready to be placed in position for firing.

At this time the deflector pad is adjusted to the desired position. If the stud is to be installed away from an adjacent wall, the parts are positioned as shown in Figure 1b so that the barrel is centrally positioned with respect to the pad. The muzzle end of the barrel is then placed in engagement with the surface and pressure is applied to the tool to cause the barrel, the ring pin carrier and associated parts to recede with respect to the remaining parts of the tool until a relative position of the deflector pad and the muzzle end of the barrel is reached as shown in full lines in Figure 5. In this position it will be noted that the deflector pad engages the surface of the wall or part into which the stud is to be driven so as to protect the operator from any flying particles at the time of ring, as well as to aid in positioning the tool substantially at right angles to the surface in which the stud is to be driven. When the parts have been fully compressed so that the ring pin latch 48 is en gaged with the notch 54 of the control cam I3, the operator gripping the housing I0 and the end grip II effects relative rotation therebetween so that there is corresponding relative rotation between the control cam I3 and the firing pin carrier. As a result the latch 48, is disengaged and the firing pin I 6 is urged forwardly to impact the cartridge and effect the firing operation.

Where a stud is to be driven closely adjacent a surface at right angles to the surface in which it is to be driven, the delector pad is positioned as shown in Figure 3 so that the aperture 88 is in its most eccentric position, or in an intermediate eccentric position, with respect to the deector pad structure as a whole.

Also i1; will be noted that at the time of firing the dust delector cup or collar 32 prevents immediate blowing of dust or concrete particles against the annular line of sliding contact of the barrel within the deflector mounting sleeve 28 thereby preventing any such particles being driven in between these parts.

While we have shown and described a preferred embodiment of the invention, it will be understood that the invention is capable of variation and modification from the form shown so that its scope should be limited only by the scope of the claims appended hereto.

I claim:

l. In a device for explosvely driving studs into surfaces including a barrel through which the stud is expelled, a sleeve surrounding said barrel at its outer end, a deiiector pad structure mounted on the lower end of said sleeve for engagement with the surface into which the stud is inserted, said pad structure including an inner body portion carried by said sleeve in off-center relation thereto and to said barrel, and an outer body portion rotatably mounted on said inner body portion about an axis in oit-center relation to said outer body portion, relative rotative movement of said body portions serving to adjust said pad structure with respect to said barrel to place said barrel adjacent an edge of said pad structure in one position of relative adjustment and substantially centrally of said pad' structure in another position of relative adjustment.

2. In a device for explosvely driving studs into surfaces including a barrel through which the stud is expelled, a sleeve surrounding said barrel at its outer end, a deector pad structure mounted on the lower end of said sleeve for engagement With the surface into which the stud' is inserted, said pad structure including an outer body portion having an off-center seat therein and an inner body portion rotatably mounted in said seat and having an off-center aperture receiving said barrel, and a dust deflector cup carried by said barrel for positioning in said aperture when the pad structure is in engagement with a surface.

3. In a device for explosvely driving studs into surfaces including a barrel through which the stud is expelled, a sleeve surrounding said barrel at its outer end, a deflector pad structure mounted on the lower end of said sleeve for engagement with the surface into which the stud is inserted, said pad structure including an inner body portion carried by said sleeve, and an outer body portion having an adjustable mounting on said inner body portion for movement with respect thereto to vary the position of the barrel with respect to the perimeter of said pad structure.

4. In a device for explosvely driving studs into surfaces including a barrel through which'the stud is expelled, a sleeve surrounding saidI barrel at its outer end, a deflector pad structure mounted on the lower end of said sleeve for engagement with the surface into which the stud is inserted, said pad structure including an inner body portion carried by said sleeve in olf-center location, and an outer body portion mounted on said inner body portion for movement with respect thereto to vary the position of the barrel with respect to the perimeter of said pad structure, including a position in which said barrel is substantially centered with respect to the said pad structure and a second position in which said barrel is positioned adjacent an edge of said pad structure.

5. In a device for explosvely driving studs into surfaces including a barrel through Whic'h the stud is expelled and adapted for engagement with a surface into which a stud is to be driven, a sleeve surrounding said barrel at its outer end,

an apertured d'elector pad structure carried by said sleeve and disposed about said barrel, and a cup-like deector carried by barrel and positioned to recede Within the pad structure with said barrel and saidl pad structure engaged with a surface.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,008,362 Littleshale July 16, 1935 2,400,878 Dunn May 28, 1946 2,470,117 Temple May 17, 1949 2,479,431 Temple Aug. 16, 1949 2,504,311 Dunn Apr. 18, 1950 

